The timeframe can be expressed either as a completion date, or a start date and completion date.

中国大学MOOC: When considering the timeframe of an investment, a rule followed by some is to choose the investment with _________ payback period.考虑一项投资的时限时，应遵循的规则是选择具有_________投资回收期的投资。

When considering the timeframe of an investment, a rule followed by some is to choose the investment with _________ payback period.考虑一项投资的时限时，应遵循的规则是选择具有_________投资回收期的投资。 A: no (无) B: the longest (最长) C: the shortest (最短) D: an infinite (无限)